Water chiller



FIG. 1 is a perspective view of a water chiller showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG.5 is a right side elevational view thereof;

FIG.6 is a top plan view thereof; and,

FIG.7 is a bottom plan view thereof.

The broken lines in the figures are included for the purpose of illustrating portions of the water chiller which form no part of the claimed design. 

CLAIM The ornamental design for a water chiller, as shown and described. 